LAUSR

Isothermal sections of the Fe-Cr-Si ternary system at 1000 and 1100 °C were studied using x-ray diffraction, scanning electron microscopy and electron probe micro-analysis. Isothermal sections were identified with seven and six three-phase regions at 1000 and 1100 °C, respectively. The σ phase contains 6.2-20.2 at.% Si at 1000 °C and 8.3-21.2 at.% Si at 1100 °C. Fe and Cr can be entirely substituted by each other to form the continuous solid-solution ε or CrSi phases. The η phase is stable at 1100 °C because of the dissolution of Cr. Additionally, large solubility was detected in some binary compounds, e.g., up to 26.6 and 19.6 at.% Fe in αCr 5 Si 3 and Cr 3 Si at 1000 °C, respectively.